Chapter 9.1
What is the name of our home galaxy?
The Milky Way
What is cosmology and what do cosmologists study?
BONUS: Who is the best presentor in the world?
Cosmology is the study of the universe, and cosmologists answer questions abt the universe
Bonus: AYNO!
What relation does the Andromeda galaxy have to the Milky Way, being the reason that astronomers study it in order to understand our own galaxy, the Milky Way better?
The Andromeda Galaxy is similar to the Milky Way in terms of its structure, mass, etc.
What are the three main shapes galaxies are sorted into?
Spiral, Elliptical, and Irregular.
What were Edward Hubbles others jobs before he became an astronomer?
Edwin Hubble first started as a highschool teacher then a lawyer before his attention turned to Astronomy
Why can dark matter not be detected?
Dark matter cannot be detected because it does not emit (give off) light.
3. Is our Sun at the center of the Milky Way? (Yes or No)
What is Cosmology and what do Cosmologists study?
Cosmology is the study of the universe. Cosmologists answer questions about the universe.
How much of the universe does visible matter make up, and how much of it does dark matter make up?
Visible matter makes up about 4% of the universe, while dark matter makes up about 23% of the universe.
How large is the Milky Way galaxy in diameter?
The Milky Way is about 100,000 light-years in diameter.
Are galaxies moving away from us or towards us and why?
Galaxies are moving away from us because most galaxies show redshift.
What was the main factor that helped astronomers figure out that dark matter existed in the Andromeda galaxy?
Astronomers studied the mass and spectra of the galaxy, and they found that stars are moving faster than they should based on the gravity in the galaxy.
What type of galaxy is the Milky Way, and what are the two types of star clusters found in it?
: The Milky Way is a spiral galaxy. The two types of star clusters found in it are Open Clusters and Globular Clusters.
Fill in the blank:
The change in ___ of a light source due to it's ___ relative to an observer.
Frequency
motion
What was the main factor that made astronomers believe in the existence of dark energy?
After the big bang theory, expansion of the universe was expected to slow down, but astronomers found that expansion has been speeding up since about 7 billion years ago.
(Dark energy is what they theorized to be the cause of this expansion)